Here are my (to-date) favorite books on writing craft; they are all very different. Some are conversational others a bit psychoanalytical, and some traverse definition altogether, but all have helped me feel less alone when the myth of writers block permeates my creative concentration.
Joyce Carol Oates The Faith of a Writer– 2003, Harper Collins
Dorothea Brande Becoming A Writer –1934, full-text avaialbe online PDF format
Dinty W. MooreThe Truth of the Matter: Art & Craft in Creative Nonfiction–2007
Charles Baxter Burning Down the House–1997
Ray Bradbury Zen in the Art of Writing
Richard Hugo The Triggering Town–1979